Driving mechanism.



No. 890,680. I PATENTBD JUNE 16, 1908.

' G. W. EUKER.

DRIVING MECHANISM.

APPLICATION FILED JUNE 24, 1905.

2 SHEETS-SHEET 1 Witnesses. inventor.

w; W George W. Euhen @W v b No. 890,680. PATEKTED JUNE 16, 1908..

G. W. EUKER.

DRIVING MECHANISM.

APPLICATION FILED JUNE 24, 1905.

LSHEETS-SHEET 2 Witnesses. Inventor.

v GeorgeWEuher. bg Attg.

mars:

GEORGE w. EUKER, or PITTSFIELD, MASSACHUSETTS, ASSIGNOR To's'rAii EY-e. 1. ELEor'nIo Eivr "FFIU MANUFACTURING COMPANY, A CORPORATION or NEW JERsEY.

DRIVING MECHANISM.

Specification of Letters Patent.

Patented .iune 1c, 1908.

Application filed June 24, 1905. Serial No. 266,781.

T 0 all whom it may concern: 1

Be it known that I, GEORGE W. EUKER, a

citizen of the United States, residing at Pittsiield, county of Berkshire, State of Massachusetts, have invented certain new and useshaftand the speed of the'sewing machine spindle. In this form of my invention I have connected to the speed varying means a device for opening and closing the motor circuit, arranging the parts so that when the speed varying means is in the position in which motion of the motor shaft causes little or no corresponding motion of the sewing machine spindle, the motor circuit is open; while in all other positions of the speed varying means, the motor circuit is closed.

The various novel features of construction,

and arrangement which characterize my in vention are pointed out with. particularity in the claims annexed to and forming a part of this specification.

For a better understanding of my invention, however, reference may be had to the accompanying drawings and A descriptive matter in which I have illustrated and described one ofthe forms in which 'my in- I vention may be embodied.

Ofithe drawings, Figure 1 is an elevation of the motor and parts directly connected --to it; Fig. 2 is an elevation. taken at right angles to Fig. 1; Fig. 3 is a'view looking up at the bottomof the construction shown in Fig. 2 Fig. A is an eievation'of a sewing machine equipped with my invention.

In the drawings, 1 represents ahollow base usually formed of cast iron on the upper side of which is rigidly secured the frame of an electric motor 2. The armature shaft 3 of the motor'which projects from the frame carries at one end a friction disk 4. Lugs or brackets 5 projecting from the base 1 have Journaled in them a shaft 6. The shaftfi 1' supports a U-shaped frame-[the parallel arms 7 of which have journale'd in their upper ends a countershaft 8. The counter shaft 8 extends transversely to the armature" shaft 3 and their axes are in the same plane. A friction wheel 9 cooperating with the friction disk 4 is s lined on the shaft 8. A

yoke or bifurcate member 10 is slidingly mounted on the shaft 6 between thearms 7. The bifurcations of the member 10 straddle the wheel 9'fso that when the member 1,0Ii's' moved along the shaft-6 the wheel 9 will be moved alongthe shaft 8. One end' of the shaft 8 carries a grooved wheel 12 which is connected bya belt 13 to the drivin wheel 14 of the sewing machine on the tab e 15' of which the base 1 is clamped. The tension of the belt 13 is adjusted to hold the friction pro er force. A bell crank lever 16 is pivframe 7.

other arm of the bell crank lever is connected,

to the treadle 19 of the sewing machine by a connecting rod 20. r

A helical spring 21 coiled about the stud crank lever 17' and the other end secured to the frame 7 forms a means for normally holding the member 10 to the extreme left of its limit of movement as seen in Fig. 1. In that position the center of the friction wheel 9 is wheel 9 against the friction disk d'wit'h' the i 17 and having one end secured'to theb'ell in line with the axis of the friction disk 4' and i a rotation of the disk 4 will not cause rotation of the wheel 9. By rocking the treadle 19' about its pivotal points of' support, the wheel 9 can be moved to the right as seen in Fig. 1, whereupon the rotation of the disk 4 will cause a rotation of the shafts 8 and a corresponding rotation of the sewing machine spindle. The speed of the shaft 8 will of course increase as the wheel 9 is moved farther away from the center ofthe disk 4.

A block 22 is secured to theunder side of the top of the base 1 by screws 23. A lever] 24 which may be formed ofany insulating material having a proper mechanical strength is pivotallyconnected tothe block 22 by a as screw 25. The inner end of the lever 24 secured it to a contact device 26. In the form of invention shown, the contact in the form of .a disk of-.nmbonwhioh'is pivotallyinounted on a scrap/12.7 carried by the inner end of the lever 24. A flexible conductor 28 has one end connected to the screw 27 and the other end to a binding post 29 carried by the base. The block 22 is formed with a kerf in its under face in which is secured a piece of spring metal 30 which may be a piece of hardened steel. The inner ends of the bar 30 carries a screw or pintle 31 on which is pivotally mounted a contact 32 which may be similar to the contact 27. A lead 33 forming one of the motor terminals is connected to the pintle 31. The lead 33 asses to the motor through the hushed openm 34 formed in the to of the base 1. The 0t er terminal 35 of t e motor, which also passes through the bushed opening 34 is connected to a binding post 36 similar to the binding post 29.

The outer end of the spring 30 bears against the edgeof the lever 24 and normally tends to move the lever in the direction to bring about engagement between the contacts 27 and 32 to close the motor circuit. The outer end of the lever 24 projects through a slot formed in the sides of the base. A pin 37 carried by the member 10 is arranged to engage the outer end of the lever 24 and move it into the position shown in Fig. 3 when the member 10 is moved into the position shown in Fig. 1. It will of course be understood that the tension of the spring 21 is great enough to overcome thespring 30 so that when the treadlc is released the spring 21 will throw the member 10' in the position shown in Fig. 1, at the same time separating the com-acts 27 and With this construction when the operator wishes to start the sewing machine she oscilbites the treadle 19 and thereby moves the member 10 away from the initial position snown in Fig. 1, against the tension of the spring 21. As soon as the pin 37 allows it to do so, the lever 24 turns under the action of the spring 30 into the position in which the contacts 27 and 32 engage, whereupon the motor is energized and begins to turn. When it is desired to stop the 'scwing machine, the trmdle is released, whereupon the spring 21 in-swcs the member 10 back into an initial iosition and opens the motor circuit.

may be secured to the bottom of the base if desired. I

The construction shown is simple; compact, reliable, and comparatively inexpensive to manufacture. It will be obvious to those skilled in the art that the invention is capable of somewhat general application and that modifications will be made in the form of the invention disclosed, without departing from its spirit.

What I claim as new and desire to secure by Letters Patent of the United States, is,

1. In combination, a hollow base, relatively movable contacts located therein, a motor supported thereon, the circuit of which is controlled by the relative position of said contacts, a friction disk mounted on the motor shaft, a friction Wheel cooperating with said disk, and means for supporting it, including a shaft upon which it is splined, and means for moving said wheel alongsaid shaft and for simultaneously changing the relati e position of said contacts.

2. In combination, an electric motor pro-- vided with a rotating shaft, a friction disk carried by said shaft, a countershaft extending transversely to said motor shaft, a friction wheel splined thereon, the periphery of said wheel engagin the face of said disk, and means tending to old the friction wheel in an initial position in which its center is in alinement with the axis of said armature shaft, a lever controlling the energization of said motor, and means for moving the friction wheel out of said initial position and for simultaneously moving said lcver' into the motor energizing pos'.tion.

3. In combination, an elec ic motor provided with a rotating shaft, a friction disk carried by said shaft, a countershaft extending transversely to said motor shaft, a friction wheelsplined thereon, the periphery of said wheel engaging the face of said disk, a spring normally holding the friction wheel in an initial position in which its center is in alinement with the axis of said armature shaft, a pair of contacts controlling the motor circuit, a spring normally holding the contacts in the position in which to close the motor circuit, and a connectionbetween said friction wheel and said contacts whereby when the wheel is moved into its initial position the contacts are opened.

' In witness whereof, I have hereunto set my hand this 20th day of June, 1905.

GEORGE YV. EUKER Witnesses A. E. BROWN, 11. F. MORSE. 

